论文部分内容阅读
以共沉淀法制得的Zr(OH)4和Y(OH)3为前驱体,在碱性条件下水热合成了ZrO2-Y2O3纳米晶;利用XRD,N2吸附脱附等温线,TEM 等表征手段考察了材料的物理化学性质。实验结果显示氧化钇的掺杂量高于5％时才能得到稳定的立方晶相,水热合成的8％Y2O3稳定的 ZrO2(YSZ)材料为高分散、粒径小(5-6 nm)且分布狭窄、具有高比表面积(约150 m2·g-1)的纳米颗粒;合适的干燥方法可减小颗粒团聚;考察了YSZ样晶的烧结性能,结果显示样品具有良好的烧结活性,900℃其晶粒即开始显著长大,1200℃烧结相对致密度高达93．9％。
Zr (OH) 4 and Y (OH) 3 prepared by coprecipitation method were used as precursors to hydrothermally synthesize ZrO2-Y2O3 nanocrystals under alkaline conditions. The XRD, N2 adsorption-desorption isotherms and TEM were used to investigate the characterization of ZrO2- The physical and chemical properties of the material. The experimental results show that when the doping amount of yttrium oxide is more than 5%, a stable cubic phase can be obtained. The hydrothermally synthesized 8% Y2O3 stabilized ZrO2 (YSZ) material is highly dispersed and has a small particle size (5-6 nm) The results show that the sample has good sintering activity and the sintering temperature is between 900 ℃ and 150 ℃. The grain began to grow significantly, the relative density of 1200 ℃ sintering up to 93.9%.